# What is the value of R in physics? ## What is the value of R in physics?

The dimensions of the universal gas constant R are energy per degree per mole. In the metre-kilogram-second system, the value of R is 8.3144598 joules per kelvin (K) per mole.

## What is r in chemistry?

Illustrated Glossary of Organic Chemistry – R group. R group: An abbreviation for any group in which a carbon or hydrogen atom is attached to the rest of the molecule. Sometimes used more loosely, to include other elements such as halogens, oxygen, or nitrogen.

## What is the SI unit of thermal conductivity?

In the International System of Units (SI), thermal conductivity is measured in watts per meter-kelvin (W/(m⋅K)). Some papers report in watts per centimeter-kelvin (W/(cm⋅K)). In imperial units, thermal conductivity is measured in BTU/(h⋅ft⋅°F).

## What is Lees method?

Lee’s method is used to measure the thermal conductivity of a poorly conducting material, such as glass, wood, or polymer. This was one of the earliest methods used to measure thermal conductivity that gave reliable results and is a steady state method.

symbol K

## What is h in heat transfer?

The convective heat transfer coefficient (h), defines, in part, the heat transfer due to convection. The convective heat transfer coefficient is sometimes referred to as a film coefficient and represents the thermal resistance of a relatively stagnant layer of fluid between a heat transfer surface and the fluid medium.

## What is H in Nusselt number?

h = convective heat transfer coefficient.